A film shape determination method for planar film antennas based on cable tension uncertainty

Abstract

The invention discloses a cable tension uncertainty-based method for determining thin film shapes of planar thin film antennas. The method comprises the following steps of: considering a thin film boundary of a planar thin film antenna as a spline, and establishing a preliminary model of a planar tensioning cable film which takes the spline as a boundary by applying ANSYS; applying a certain tensioning force on a suspension cable, and carrying out static analysis to obtain stress distribution of the cable and the film; defining a deviation range of cable tension, and finding a group of corresponding cable tension when the deviation between a practical stress of a cable-film structure and a reference stress is maximum; searching a next optimal curve control point position through minimizing a stress deviation value output in the step 3); and updating the thin film shape through the optimized curve control point until the relative change amount of the cable-film structure satisfies the accuracy requirement of a convergence criterion, so as to obtain an optimal thin film shape. According to the method, the limits of specific boundary shapes are broken through, and robustness optimization is carried out on the structure, so that the thin film shape is determined more correctly and the service life of materials is prolonged at the same time.

Description

technical field [0001] The invention belongs to the field of antenna structures, in particular to a method for determining the film shape of a planar film antenna based on the uncertainty of cable tension. Background technique [0002] In recent years, with the rapid development of aerospace technology, more and more thin-film structures have been applied to the field of antennas due to their unique advantages such as light weight and large folding ratio. Among them, planar thin-film antennas have become a hot field of research for scholars. The cable system is stretched on the surrounding rigid frame. Since different membrane shapes have an important impact on the stress distribution and accuracy of the membrane surface, the membrane shape has become an important research content of the antenna structure design. [0003] The traditional film shape determination is to analyze several specific boundary shapes such as parabola, arc, ellipse, etc. under the assumption that the ...

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Problems solved by technology

[0006] The purpose of the present invention is to propose a planar film antenna film shape based on the uncertainty of cable tension for the current planar film antenna that does not consider the uncertainty of the cable tension in the process of determining the film shape and the method of determining the film shape is too limited. determination method

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